Many of you have seen the six pointed evenly spaced star? Did you know that it refers to the energy field around humans and anything emitting energy including planets? It extends 50 feet beyond you so I will say its  larger than the Aura around someone. The aura is the energy field around a person approximately the 10 feet around them in all directions. Seen on crystals, jewelry it is meant to be a focal point of concentration and meditation. Many focus on it while meditating and receive clear guidance. Something worth trying on your next meditative exploration. Merkabas come in every stone known to man and the sizes vary as well. As usual, with all things spiritual, please follow your inner guidance and do what feels comfortable. Enjoy and please let me know what happens for you!